共沉淀法制备Pr:LuAG粉体及其性能研究

Study on the Preparation of Pr:LuAG Powder by Co-precipitation Method and Its Properties

采用共沉淀法,以NH_4HCO_3与NH_3·H_2O混合溶液为沉淀剂,制备Pr:LuAG (分子式形式为Pr_(0.09)Lu_(2.91)Al_5O_(12))纳米粉体。通过X射线衍射和扫描电镜分析,确定制备粉体的最佳工艺条件为:液相沉淀pH为8,煅烧温度为1100℃,煅烧时间2h,分散剂PEG分子量10000。对最佳条件制得的粉体进行了红外光谱、激发和发射光谱、荧光光谱测试,分析表明陶瓷粉体体系能被452nm的蓝光和285nm的近紫外光有效激发,当激发源为452nm蓝光时,最强发射峰位于488nm处,对应于Pr^(3+)的~3P_0至~3H_4的跃迁。荧光光谱中,被激发源为580nm黄光激发时,Pr^(3+)的~3P_2→~3H_4能级跃迁引发的453nm发射谱峰强度最高。

Pr:LuAG nanopowders was synthesized by co-precipitation method using NH4HCO3 and NH3·H2O mixed solution as precipitant.By X-ray diffractometry and scanning electron microscope analysis,the optimum technological conditions nanoparticles preparation was decided as follows:the solution pH obtained was 8,calcination temperature was 1100℃for 2h,the dispersing agent(PEG)molecular weight was 10000.The powders obtained by the optimum conditions were tested by infrared spectra,excitation and emission spectra and fluorescence spectra.The analysis shows that the powder system can be effectively excited by the blue light of 452 nm and the near ultraviolet light of 285nm.When the excitation source is the blue light of 452 nm,the strongest emission peak is at 488nm,corresponding to the 3P0→3H4 transition of Pr3+.In the fluorescence spectra,when the excited source is the yellow light of 580nm,the intensity of 453nm emission spectrum induced by the 3P2→3H4 level transition of Pr3+is the highest.